Railroad Archives Online
- FondD0288 - Terence Wahl Collection
- Sorozat002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Alsorozat014 - Photographs
- 004 - Railroad tracks
- 003 - Railroad yards
- IratdarabTRWahl0451 - Milwaukee Road Freight Yard, Bellingham, Washington, undated
- IratdarabTRWahl1024 - Milwaukee Road Freight Yard, Bellingham, Washington, undated